TecMate TM-341 Optimate 4 Dual Program, 9-Step 12V 1A Battery Saving Charger-Tester-maintainer OptiMate 4 Dual Program includes two charging programs; program 1 is for direct charging of a battery, program 2 allows safe and unsupervised charging SAVE: Low Volt Start of 0.5V + 2-step desulphation recovery (1-step low volt pulse save during CAN-bus mode); CHARGING AMPS: 1A (constant current). Model TM-341 IDEAL FOR: STD, AGM & GEL 12V batteries from 3 - 50Ah. Automatic KEY-LESS activation and continued maintenance until charger is disconnected. INPUT: Global (100-240V 50-60Hz), high efficiency (CEC listed), fully sealed.